Glucocorticoid dysregulation of natural killer cell function through epigenetic modification
| Autor: | Kelly Loster Kosik, Justin L. Eddy, Linda Witek Janusek, Herbert L. Mathews, Karen Krukowski, Teresa Konley |
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| Rok vydání: | 2010 |
| Předmět: |
Chromatin Immunoprecipitation
Protein Folding medicine.drug_class Immunology Intracellular Space Enzyme-Linked Immunosorbent Assay Cell Degranulation Dexamethasone Article Natural killer cell Cell Line Epigenesis Genetic Histones Behavioral Neuroscience Interferon-gamma Lysosomal-Associated Membrane Protein 1 medicine Humans Interferon gamma Glucocorticoids Regulation of gene expression biology Endocrine and Autonomic Systems Perforin Histone deacetylase inhibitor Membrane Proteins Acetylation Flow Cytometry Granzyme B Histone Deacetylase Inhibitors Killer Cells Natural medicine.anatomical_structure Granzyme Gene Expression Regulation biology.protein Cancer research Cytokines K562 Cells Glucocorticoid medicine.drug |
| Zdroj: | Brain, behavior, and immunity. 25(2) |
| ISSN: | 1090-2139 |
| Popis: | It is well-established that psychological distress reduces natural killer cell activity (NKCA) and dysregulates cytokine balance. This may be mediated by stress-induced release of glucocorticoids, which have broad effects on the immune system, including the suppression of NKCA and alteration of cytokine production. The purpose of this study was to evaluate epigenetic mechanisms that may underlie the effect of glucocorticoids on NK cells, using the human NK cell line, NK92. Treatment of NK92 cells with the synthetic glucocorticoid, dexamethasone, at a concentration of 10⁻⁷M, produced a significant reduction in NKCA. Glucocorticoid inhibition was a consequence of not only a reduced capacity of the NK cells to bind to tumor targets but also a reduced production of granule constituents (perforin and granzyme B) with no detectable effect on granule exocytosis. Glucocorticoids also reduced the constitutive and the stimulated production of the cytokines, IL-6, TNF alpha and IFN gamma, and reduced the surface expression of LFA-1. Glucocorticoid treatment also reduced global histone acetylation, the acetylation of histone 4 lysine position 8, and the accessibility of the proximal promoters of perforin, interferon gamma and granzyme B. Histone acetylation was recovered by treatment of the NK cells with a histone deacetylase inhibitor, which also restored NKCA and IFN gamma production. These results demonstrate glucocorticoids to dysregulate NK cell function at least in part through an epigenetic mechanism, which reduces promoter accessibility through modification of histone acetylation status. This epigenetic modification decreases the expression of effector proteins necessary to the full functional activity of NK cells. |
| Databáze: | OpenAIRE |
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